Abstract:
An apparatus and a method for controllably converting aluminum into alane. In the system of the invention, a reaction between aluminum and hydrogen to form alane is performed at temperatures below 100 °C using a supercritical fluid such as CO2 as a reaction medium, with the optional inclusion of a co-solvent, such as an ether, in the reaction vessel. Inert gas is used to exclude unwanted gases such as oxygen. The reaction of aluminum and hydrogen has been observed to proceed at approximately 60 °C using Me2O as an added solvent in CO2 at supercritical pressures.
Abstract:
An apparatus and a method for controllably converting aluminum into alane. In the system of the invention, a reaction between aluminum and hydrogen to form alane is performed at temperatures below 100 °C using a supercritical fluid such as CO2 as a reaction medium, with the optional inclusion of a co-solvent, such as an ether, in the reaction vessel. Inert gas is used to exclude unwanted gases such as oxygen. The reaction of aluminum and hydrogen has been observed to proceed at approximately 60 °C using Me2O as an added solvent in CO2 at supercritical pressures.
Abstract:
A method of purifying a UF6 gas stream which comprises irradiating the UF6 gas stream with laser radiation in a vessel in order to selectively convert fluoride impurities in the gas stream to involatile products, removing the purified UF6 gas stream from the vessel and separately removing the impurities from the vessel.
Abstract:
A halogen generator which uses a material which absorbs commercially available halogen and, on being heated, releases the halogen in a very pure form, i.e. > 99.7 %. Such a generator can be used in a gas management system for an excimer laser in which the laser gas contains a halogen donor, an active rare gas and an inert gas diluent. Cleaners are provided to enable the removal from the laser gas mixture of contaminants which build up in operation of the laser and the halogen gas generator is provided to replace halogen lost in the contaminants and elsewhere. The generator can be operated even when the laser is in operation so that a desired partial pressure of the halogen can be maintained.
Abstract:
Systems and methods for producing ammonia. In one approach, Li3N is reacted with hydrogen to produce ammonia and is regenerated using nitrogen. Catalysts comprising selected transition metals or their nitrides can be used to promote the reactions. In another approach, supercritical anhydrous ammonia is used as a reaction medium to assist the reaction of hydrogen with nitrogen to produce ammonia, again promoted using catalysts.
Abstract:
An improved form of halogen generator in which the heat path from the interior walls to the halogen source is made short so as to improve uniformity of heating of the source and to obtain a more uniform and controllable output from the generator.
Abstract:
Systems and methods for extracting, handling and upgrading carbonaceous material. The systems and methods involve forming a reaction mixture of a carbonaceous material, a supercritical fluid, a catalyst and a source of hydrogen, and maintaining the reaction mixture at moderate temperatures for modest time periods. Exemplary reaction temperatures are those below 200 0C. Exemplary reaction times range from 30 minutes to less than 24 hours.
Abstract:
The invention provides systems and methods for preparing a metal hydride, such as LiAlH4, that can be dehydrogenated and rehydrogenated under mild conditions. The hydride includes a dopant, such as 0.2 to 0.5 mol% titanium salt ball milled with the hydride. The hydrogenation is performed using Me2O as a solvent for H2 under conditions of approximately 100 bar H2 pressure at 120 °C. The Me2O solvent is removed at ambient temperature, to provide a dry, hydrogenated powder. Hydrogen evolves from the hydrogenated powder at temperatures as low as 80 °C.
Abstract:
Systems and methods for producing ammonia. In one approach, Li3N is reacted with hydrogen to produce ammonia and is regenerated using nitrogen. Catalysts comprising selected transition metals or their nitrides can be used to promote the reactions. In another approach, supercritical anhydrous ammonia is used as a reaction medium to assist the reaction of hydrogen with nitrogen to produce ammonia, again promoted using catalysts.
Abstract:
An improved design of halogen generator in which gas entering the generator is pre-heated to prevent cooling of the halogen source in the generator and gas flow through the generator exhibits improved uniformity, to give a more consistent performance from the generator.